I was checking out the issue for your site and the issue was because of a large number of intermediate sizes (These are the sizes I'm talking about https://codex.wordpress.org/Function_Reference/add_image_size ), as a result when API sends a response to the website for bulk smushing completion ( which contains all the image urls and stats ), it was being rejected because the response was too big for the Web Server, to handle.

I've reduced the number of images sent in 1 bulk request from 1000 to 800 and tried 2 bulk smushes, it works fine.

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